First, call your insurance agent. You're probably going to need lots of liability coverage for when the wheel disintegrates and you run over a minivan with a soccer mom and a bunch of kids in it. Better increase your life insurance while you're at it, so your family will be cared for if you don't survive the carnage.

All the tubeless tire rims (the ones that end in a .5 measurement) have tapered tire bead seats. Any attempt to flatten the bead seat area on a steel wheel to accommodate a different design of tire bead would end up with cutting the entire bead area off. The thickness of a steel wheel in the bead seat area is 1/4" or less and there's no room for reshaping. Even doing that on an alloy wheel would make it deadly dangerous by thinning the stressed area where the tire bead meets the rim.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!